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Duplicate service key in XML configuration
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Detects duplicate service keys in Symfony XML configuration files.
Each service ID must be unique within the services section.
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Example:
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<pre><code>
&lt;services&gt;
    &lt;service id="my_service" class="App\Service\MyService" /&gt;
    &lt;service id="my_service" class="App\Service\OtherService" /&gt; &lt;!-- Duplicate ID --&gt;
&lt;/services&gt;
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